protista amoeba chlamydomonas euglena paramecium
TRANSCRIPT
Protista
Amoeba
Chlamydomonas
Euglena
Paramecium
ClassificationBased on method of locomotion • Rhizopoda – have pseudopodia eg amoeba
• Flagellates include Chlamydomonas & Euglena
• Ciliates include Paramecium
Amoeba• No definite shape
• Phagocytosis food vacuole stores and digests
• Moves by anterior and secondary pseudopods.
Would you expect to find an eye spot in amoeba?
No – amoeba doesn’t need light – no photosynthesis!
contractile vacuole
food vacuole
pseudopod
http://www.microscopyu.com/moviegallery/pondscum/amoeba/ (very short)
Chlamydomonas• Unicellular flagellate green alga.
• Chloroplasts for photosynthesis.
• Pyrenoids are centres of carbon dioxide fixation within the chloroplasts of algae
Would chlamydomonas have an eye spot?
Yes – chlamydomonas photosynthesises! Eye spot is part of the large chloroplast
contractile vacuole
chloroplast
flagellum
Euglena• Heterotrophic phagocytosis AND Autotrophic
photosynthesis (has chloroplasts)
• Fresh water / salt water / soil.
• Whip-like flagellum.
• Can form dormant spore in dry conditions.
Would euglena have an eye spot?
Yes – usually red, near flagellum.
eye spot
contractile vacuolechloroplast
http://www.microscopyu.com/moviegallery/pondscum/euglena/ (very short)
Paramecium• Freshwater ciliate
• Deep oral groove with oral cilia which draw food inside.
• The bubbles throughout the cell are also vacuoles.
• Cilia all over the body or restricted only to certain regions.
Would paramecium have an eye spot?
No
http://www.youtube.com/watch?v=l9ymaSzcsdY&NR=1&feature=fvwp (eating)
contractile vacuoles
meganucleus
http://www.microscopyu.com/moviegallery/pondscum/paramecium/ (short)
Organism Nutrition Movement Osmoregulation Eye spot
Amoeba heterotrophic
Paramecium cilia
Euglena contractile vacuole
Chlamydomonas y
Complete table in Chilton booklet
Organism Nutrition Movement Osmoregulation Eye spot
Amoeba heterotrophic pseudopodia Contractile vacuoles
n
Paramecium heterotrophic cilia Contractile vacuoles
n
Euglena heterotrophic and
autotrophic
flagellum contractile vacuole
y
Chlamydomonas heterotrophic and
autotrophic
flagella Contractile vacuoles
y
Handouts
• Unicellular Protists handout
Clickview
Homeostasis (25 min)
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Key Words
Exercises
Quick Quiz
Videos
RecapLabel fun
Key words• Metabolism• Substrate• Product• Reaction rate• Enzyme• Globular protein• Biological catalyst• 3D structure• Denaturation• Active site• Specificity
• Enzyme-substrate complex
• Lock and Key model• Induced fit model• Exergonic• Endergonic• Activation energy
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Quick quiz1. Chemical reactions in living cells are _____ reactions
2. ____ reactions build up molecules
3. ____ reactions break down molecules
4. ____ speed up reactions
5. ____ are biological catalysts
6. Enzymes are made of ____
7. Enzymes are ____-shaped
8. Enzyme function depends on its ____
9. The ____ site of the enzyme binds with the substrate
10.____ model: substrate must fit exactly into the enzyme
11.____ model: enzyme shape can change to fit
12.Enzymes lower the ____ required to initiate a reaction
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Answers
Quick quiz1. Chemical reactions in living cells are metabolic
reactions
2. Anabolic reactions build up molecules
3. Catabolic reactions break down molecules
4. Catalysts speed up reactions
5. Enzymes are biological catalysts
6. Enzymes are made of protein
7. Enzymes are globular-shaped
8. Enzyme function depends on its shape
9. The active site of the enzyme binds with the substrate
10.Lock and key model: substrate must fit exactly into the enzyme
11.Induced fit model: enzyme shape can change to fit
12. Enzymes lower the activation energy required to initiate a reaction
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Exercise
• Workbook p58 • Pathfinder pp42-3 qq 1-4 • Chilton Booklet
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Videos• http://www.youtube.com/watch?v=oddMUHIj0wI
• http://www1.teachertube.com/viewVideo.php?title=Kingdom_Protista&video_id=223926 (7minutes)
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Recap Back to menu
Draw and label each
protist
Pathfinder p43, q1-3
Pair up with a friend and teach each
other
Draw a mind-map of
important processes
Chilton booklet
worksheet
AmoebaOsmoregulation – contractile vacuoles expel ___________
Nutrition – pseudopods engulf _____
Contains ingested ___________
Locomotion – flowing of __________
food
psudopod
water
foodBack to menu
2 hairlike projections for rapid, jerky movement
composed of cellulose
cell wall
flagellafor light detection
eye spot
osmoregulation
contractile vacuole
storage
starch granule
starch formation
pyrenoid
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beats for locomotion
eye spot for light detection
flexible, inside plasma membrane – cell can change shape
osmoregulation
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2
beat for locomotion
oral groove with cilia to beat food into mouth
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Mitosis and Cytokinesis
No sexual reproduction
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